Panel line washes - why can't I get them right?

[TonyOD]

I've been trying to bring a bit of life to my models by adding a dark wash to panel lines, using Humbrol enamel washes. I give the model a coat of Klear first and let it sure for minimum 24 hours, the theory being that with capillary action the wash should "flow" down the panel line, but it doesn't, so I end up just painting a line of wash along the line. Then when taking off the excess (after a drying time of 20-30 minutes) I find that most of that I've put on just lifts out of the line and I'm back to square one. I've tried dabbing with just the most slightly thinner-moistened bit of kitchen towel then using a dry bit to wipe it away, but I can't seem to get a satisfactory result. I feel this is much harder than it should be, What am I doing wrong?